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Finding the Fourth Proportional to 218.80, 328.40 and 188.40

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Solution

The fourth proportional to 218.80, 328.40 and 188.40 is: 282.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.80 : 328.40 = 188.40 : x
  2. Step 2: Convert to fraction form
    218.80/328.40 = 188.40/x
  3. Step 3: Cross multiply
    218.80x = 328.40 × 188.40
  4. Step 4: Simplify right side
    218.80x = 61,870.56
  5. Step 5: Solve for x
    x = 61,870.56/218.80
  6. Step 6: Final answer
    x = 282.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.